make all firmware-* packages build faster with "pmb:cross-native"

For all firmware packages that we have, we are just repackaging a bunch of blobs. There is no need to set up a foreign arch chroot, install compilers etc. as we are doing now.

• create a CI test test_aports_firmware just like test_aports_kernel
  • it should verify that we have options="pmb:cross-native !tracedeps" in the APKBUILD of every firmware-* package
• run the CI check once, it should report all firmware packages
• adjust all firmware packages, so it does not fail anymore
• build packages locally to make sure this works
• commit changes. do not change the pkgrel, as we don't change the contents!
• create the merge request